Korean metal chopsticks

Korean food is typically served with hollow metal chopsticks. Hollow, to reduce the weight, and metal? The jury is out as to why they are metal. Some sources attribute it to the availability of materials, others to reasons of hygiene. There is even a school of thought that suggests that the manual dexterity required to use a pair of metal chopsticks has helped the Korean nation develop its skills in other activities that require utmost precision, such as semi conductor manufacturing, archery and table tennis.